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This commit is contained in:
huoji
2023-05-07 22:49:11 +08:00
parent e8a3b9fa98
commit b00e51fdc7
38 changed files with 860 additions and 954 deletions
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4
.vscode/settings.json vendored
View File

@@ -109,7 +109,9 @@
"memory_resource": "cpp", "memory_resource": "cpp",
"numeric": "cpp", "numeric": "cpp",
"string_view": "cpp", "string_view": "cpp",
"numbers": "cpp" "numbers": "cpp",
"ip_hashmap.h": "c",
"client_msg.h": "c"
}, },
"C_Cpp.errorSquiggles": "enabled" "C_Cpp.errorSquiggles": "enabled"
} }

5
linux_kernel/.msg.o.d
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@@ -358,4 +358,7 @@ msg.o: /home/duck/project/linux_kernel/msg.c \
include/uapi/linux/udp.h include/linux/inet.h include/linux/cdev.h \ include/uapi/linux/udp.h include/linux/inet.h include/linux/cdev.h \
/home/duck/project/linux_kernel/some_struct.h \ /home/duck/project/linux_kernel/some_struct.h \
/home/duck/project/linux_kernel/global.h \ /home/duck/project/linux_kernel/global.h \
/home/duck/project/linux_kernel/msg.h /home/duck/project/linux_kernel/msg.h \
/home/duck/project/linux_kernel/ip_hashmap.h \
/home/duck/project/linux_kernel/network.h \
/home/duck/project/linux_kernel/client_msg.h

2
linux_kernel/Makefile
View File

@@ -1,6 +1,6 @@
CONFIG_MODULE_SIG=n CONFIG_MODULE_SIG=n
obj-m += safe_duck.o obj-m += safe_duck.o
safe_duck-objs := main.o msg.o global.o some_struct.o safe_duck-objs := main.o msg.o global.o some_struct.o ip_hashmap.o network.o client_msg.o
PWD := $(shell pwd) PWD := $(shell pwd)
KVER := $(shell uname -r) KVER := $(shell uname -r)
KDIR := /lib/modules/$(KVER)/build KDIR := /lib/modules/$(KVER)/build

4
linux_kernel/Module.symvers
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@@ -1,5 +1,5 @@
0x8d232039 push_msg /home/duck/project/linux_kernel/safe_duck EXPORT_SYMBOL 0xe98895fa push_msg /home/duck/project/linux_kernel/safe_duck EXPORT_SYMBOL
0x4b7cb975 get_msg /home/duck/project/linux_kernel/safe_duck EXPORT_SYMBOL 0xb1b3bd13 get_msg /home/duck/project/linux_kernel/safe_duck EXPORT_SYMBOL
0xb3ceb32b get_msg_list_length /home/duck/project/linux_kernel/safe_duck EXPORT_SYMBOL 0xb3ceb32b get_msg_list_length /home/duck/project/linux_kernel/safe_duck EXPORT_SYMBOL
0x38a1fb31 cleanup_msg /home/duck/project/linux_kernel/safe_duck EXPORT_SYMBOL 0x38a1fb31 cleanup_msg /home/duck/project/linux_kernel/safe_duck EXPORT_SYMBOL
0x50632040 init_msg /home/duck/project/linux_kernel/safe_duck EXPORT_SYMBOL 0x50632040 init_msg /home/duck/project/linux_kernel/safe_duck EXPORT_SYMBOL

14
linux_kernel/client_msg.c Normal file
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@@ -0,0 +1,14 @@
#include "client_msg.h"
void dispath_client_msg(struct client_msg_t* msg) {
switch (msg->type) {
case SD_MSG_TYPE_CLIENT_BLOCK_IP:
const size_t target_ip_address = msg->u.ip_address.src_ip;
const size_t block_time = msg->u.ip_address.block_time;
block_ip_address(target_ip_address, block_time);
break;
default:
printk(KERN_INFO "Unknown msg type: %d\n", msg->type);
break;
}
}

3
linux_kernel/client_msg.h Normal file
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@@ -0,0 +1,3 @@
#pragma once
#include "head.h"
extern void dispath_client_msg(struct client_msg_t* msg);

6
linux_kernel/head.h
View File

@@ -20,9 +20,15 @@
#include <linux/errno.h> #include <linux/errno.h>
#include <linux/spinlock.h> #include <linux/spinlock.h>
#include <linux/cdev.h> #include <linux/cdev.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/hash.h>
#include "some_struct.h" #include "some_struct.h"
#include "global.h" #include "global.h"
#include "msg.h" #include "msg.h"
#include "ip_hashmap.h"
#include "network.h"
#include "client_msg.h"
#define DEVICE_NAME "safe_duck" #define DEVICE_NAME "safe_duck"
#define DEVICE_CNT 1 #define DEVICE_CNT 1
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");

173
linux_kernel/ip_hashmap.c Normal file
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@@ -0,0 +1,173 @@
#include "ip_hashmap.h"
static struct ip_hash_table g_ip_hashtable;
void thread_demon_ip_hashmap(void *ctx) {
struct hlist_head *head;
struct hlist_node *node, *tmp;
struct ip_hashmap_node_t *data;
while (!kthread_should_stop()) {
msleep_interruptible(30000); // 每 30 秒执行一次清理操作
const s64 current_time_sec = ktime_get_real_seconds();
spin_lock(&g_ip_hashtable.lock);
for (int i = 0; i < g_ip_hashtable.bucket_num; ++i) {
head = &g_ip_hashtable.heads[i];
hlist_for_each_safe(node, tmp, head) {
data = container_of(node, struct ip_hashmap_node_t, node);
if (data) {
s64 time_diff =
(s64)((s64)data->info.ip_meta_info.remove_time -
(s64)data->info.ip_meta_info.last_attack_time);
if ((data->info.ip_meta_info.is_attack == false) ||
(time_diff <= 0)) {
hlist_del(&data->node);
kfree(data);
}
}
}
}
spin_unlock(&g_ip_hashtable.lock);
}
printk(KERN_INFO "cleanup_iphashmap thread stopped\n");
}
// 初始化哈希表对象
bool init_ip_hashmap(void) {
struct ip_hash_table *table = &g_ip_hashtable;
table->bucket_num = BUCKET_NUM;
table->heads = kzalloc(BUCKET_NUM * sizeof(struct hlist_head), GFP_KERNEL);
if (table->heads) {
for (int i = 0; i < BUCKET_NUM; ++i) {
INIT_HLIST_HEAD(&table->heads[i]);
}
}
spin_lock_init(&table->lock); // 初始化锁
// 新建线程，执行清理操作
table->cleanup_thread = kthread_run((void *)thread_demon_ip_hashmap, NULL,
"thread_demon_ip_hashmap");
if (IS_ERR(table->cleanup_thread)) {
printk(KERN_ERR "Failed to create cleanup thread\n");
return false;
}
return true;
}
// 检查是否需要动态调整桶的数量
void check_resize_table(struct ip_hash_table *table) {
unsigned int bucket_num = table->bucket_num;
int count = 0;
for (int i = 0; i < bucket_num; ++i) {
struct hlist_head *head = &table->heads[i];
if (!hlist_empty(head)) {
count++;
}
}
if ((count * 100 / bucket_num) > 70) {
table->bucket_num = 2 * bucket_num;
struct hlist_head *new_heads =
kzalloc(table->bucket_num * sizeof(struct hlist_head), GFP_KERNEL);
if (new_heads) {
for (int i = 0; i < table->bucket_num / 2; ++i) {
struct hlist_node *node, *tmp;
hlist_for_each_safe(node, tmp, &table->heads[i]) {
struct ip_hashmap_node_t *data =
container_of(node, struct ip_hashmap_node_t, node);
hlist_del(&data->node);
int idx =
hash_32(data->info.ip_address_key, table->bucket_num);
hlist_add_head(&data->node, &new_heads[idx]);
}
}
kfree(table->heads);
table->heads = new_heads;
}
}
}
// 获取并插入哈希表节点
void put_ipdata_by_hashmap(size_t ip_address_key,
struct ip_hashmap_info *info) {
struct ip_hash_table *table = &g_ip_hashtable;
int idx = hash_32(ip_address_key, table->bucket_num);
// 新建哈希表节点
struct ip_hashmap_node_t *data =
kmalloc(sizeof(struct ip_hashmap_node_t), GFP_KERNEL);
if (data) {
memcpy(&data->info, info, sizeof(struct ip_hashmap_info));
spin_lock(&table->lock);
hlist_add_head(&data->node, &table->heads[idx]);
check_resize_table(table);
spin_unlock(&table->lock);
}
}
// 通过关键字获取哈希表节点
struct ip_hashmap_node_t *get_ipdata_by_hashmap(size_t ip_address_key) {
struct ip_hash_table *table = &g_ip_hashtable;
spin_lock(&table->lock);
int idx = hash_32(ip_address_key, table->bucket_num);
struct hlist_head *head = &table->heads[idx];
struct hlist_node *node = head->first;
while (node) {
struct ip_hashmap_node_t *data =
container_of(node, struct ip_hashmap_node_t, node);
if (ip_address_key == data->info.ip_address_key) {
spin_unlock(&table->lock);
return data;
}
node = node->next;
}
spin_unlock(&table->lock);
return NULL;
}
// 从哈希表中删除节点
void del_ipdata_by_hashmap(size_t ip_address_key) {
struct ip_hash_table *table = &g_ip_hashtable;
spin_lock(&table->lock);
int idx = hash_32(ip_address_key, table->bucket_num);
struct hlist_head *head = &table->heads[idx];
struct hlist_node *node = head->first;
while (node) {
struct ip_hashmap_node_t *data =
container_of(node, struct ip_hashmap_node_t, node);
if (ip_address_key == data->info.ip_address_key) {
hlist_del(&data->node);
kfree(data);
break;
}
node = node->next;
}
// 检查是否需要调整桶的数量
check_resize_table(table);
spin_unlock(&table->lock);
}
void cleanup_iphashmap(void) {
kthread_stop(g_ip_hashtable.cleanup_thread); // 停止清理线程
if (g_ip_hashtable.heads) {
spin_lock(&g_ip_hashtable.lock);
struct hlist_head *head, *tmp;
struct hlist_node *node;
struct ip_hashmap_node_t *data;
// 释放哈希表节点动态分配的内存
for (int i = 0; i < g_ip_hashtable.bucket_num; ++i) {
head = &g_ip_hashtable.heads[i];
hlist_for_each_entry_safe(data, node, head, node) {
hlist_del(&data->node);
kfree(data);
}
}
kfree(g_ip_hashtable.heads);
spin_unlock(&g_ip_hashtable.lock);
}
printk(KERN_INFO "clean up iphashmap\n");
}

41
linux_kernel/ip_hashmap.h Normal file
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@@ -0,0 +1,41 @@
#pragma once
#include "head.h"
#define BUCKET_NUM 1000 // 初始桶的数量
struct ip_hash_table {
struct hlist_head *heads; // 存放桶的指针数组
unsigned int bucket_num; // 当前桶的数量
spinlock_t lock; // 锁，确保同步和互斥访问哈希表
struct task_struct *cleanup_thread; // 执行清理操作的线程
};
// 定义哈希表节点
struct syn_scan_info_t {
size_t last_seen;
size_t num_syn_packets;
};
struct crack_ip_info_t {
size_t last_seen;
size_t num_connect;
};
struct ip_meta_info_t {
bool is_attack;
size_t last_attack_time;
size_t remove_time;
};
struct ip_hashmap_info {
size_t ip_address_key;
struct syn_scan_info_t syn_scan_info;
struct crack_ip_info_t crack_ip_info;
struct ip_meta_info_t ip_meta_info;
};
struct ip_hashmap_node_t {
struct hlist_node node; // 哈希表链表节点
struct ip_hashmap_info info;
};
extern bool init_ip_hashmap(void);
extern void check_resize_table(struct ip_hash_table *table);
extern void put_ipdata_by_hashmap(size_t ip_address_key,
struct ip_hashmap_info *info);
extern struct ip_hashmap_node_t *get_ipdata_by_hashmap(size_t ip_address_key);
extern void del_ipdata_by_hashmap(size_t ip_address_key);
extern void cleanup_iphashmap(void);

105
linux_kernel/main.c
View File

@@ -1,36 +1,5 @@
#include "head.h" #include "head.h"
struct safe_duck_dev {
wait_queue_head_t read_wait;
};
unsigned int network_callback(const struct nf_hook_ops *ops,
struct sk_buff *skb, const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *)) {
do {
if (skb == NULL) {
break;
}
struct iphdr *ip_header = ip_hdr(skb);
if (ip_header == NULL) {
break;
}
// push ip address to list
struct kernel_msg_t *msg =
kmalloc(sizeof(struct kernel_msg_t), GFP_KERNEL);
if (msg == NULL) {
printk(KERN_ERR "Failed to allocate memory for new msg\n");
break;
}
msg->type = SD_MSG_TYPE_NEW_IP_CONNECT;
msg->u.poll_req.src_ip = ip_header->saddr;
push_msg(msg);
} while (false);
return NF_ACCEPT;
}
unsigned int driver_poll_callback(struct file *filep, unsigned int driver_poll_callback(struct file *filep,
struct poll_table_struct *wait) { struct poll_table_struct *wait) {
unsigned int mask = 0; unsigned int mask = 0;
@@ -61,6 +30,32 @@ ssize_t safe_duck_read(struct file *file, char __user *buf, size_t count,
return ret; return ret;
} }
ssize_t safe_duck_write(struct file *filp, const char __user *buf, size_t count,
loff_t *f_pos) {
if (count > sizeof(struct client_msg_t)) {
return -EINVAL;
}
struct client_msg_t *message =
kmalloc(sizeof(struct client_msg_t), GFP_KERNEL);
do {
if (message == NULL) {
printk(KERN_ERR "Failed to allocate memory for new msg\n");
break;
}
if (copy_from_user(message, buf, sizeof(struct client_msg_t))) {
return -EFAULT;
}
if (message->check_sum != MSG_CHECK_SUM) {
printk(KERN_ERR "Invalid checksum\n");
break;
}
dispath_client_msg(message);
} while (false);
if (message != NULL) {
kfree(message);
}
return count;
}
int safe_duck_open(struct inode *inode, struct file *filep) { return 0; } int safe_duck_open(struct inode *inode, struct file *filep) { return 0; }
bool build_dev(void) { bool build_dev(void) {
int rc = alloc_chrdev_region(&g_driver_dev_build.devid, 0, DEVICE_CNT, int rc = alloc_chrdev_region(&g_driver_dev_build.devid, 0, DEVICE_CNT,
@@ -71,6 +66,8 @@ bool build_dev(void) {
printk("newchrled chr_dev region err\n"); printk("newchrled chr_dev region err\n");
return false; return false;
} }
g_driver_dev_build.init_chrdev_region = true;
printk(KERN_WARNING "major:%d, minor:%d\n", g_driver_dev_build.major, printk(KERN_WARNING "major:%d, minor:%d\n", g_driver_dev_build.major,
g_driver_dev_build.minor); g_driver_dev_build.minor);
cdev_init(&g_driver_dev_build.cdev, &g_fops); cdev_init(&g_driver_dev_build.cdev, &g_fops);
@@ -80,16 +77,40 @@ bool build_dev(void) {
if (IS_ERR(g_driver_dev_build.class)) { if (IS_ERR(g_driver_dev_build.class)) {
return false; return false;
} }
g_driver_dev_build.init_cdev_add = true;
g_driver_dev_build.device = g_driver_dev_build.device =
device_create(g_driver_dev_build.class, NULL, g_driver_dev_build.devid, device_create(g_driver_dev_build.class, NULL, g_driver_dev_build.devid,
NULL, DEVICE_NAME); NULL, DEVICE_NAME);
return IS_ERR(g_driver_dev_build.device) == false; const bool build_dev_success = IS_ERR(g_driver_dev_build.device) == false;
if (build_dev_success) {
g_driver_dev_build.init_device_create = true;
}
return build_dev_success;
} }
void destory_dev(void) { void destory_dev(void) {
cdev_del(&g_driver_dev_build.cdev); if (g_driver_dev_build.init_cdev_add) {
unregister_chrdev_region(g_driver_dev_build.devid, DEVICE_NAME); cdev_del(&g_driver_dev_build.cdev);
device_destroy(g_driver_dev_build.class, g_driver_dev_build.devid); }
class_destroy(g_driver_dev_build.class); if (g_driver_dev_build.init_chrdev_region) {
unregister_chrdev_region(g_driver_dev_build.devid, DEVICE_NAME);
}
if (g_driver_dev_build.init_device_create) {
device_destroy(g_driver_dev_build.class, g_driver_dev_build.devid);
}
if (g_driver_dev_build.init_cdev_add) {
class_destroy(g_driver_dev_build.class);
}
}
int cleanup(void) {
if (g_driver_dev_build.init_netfilter) {
nf_unregister_net_hook(&init_net, &g_network_hook_ops);
}
if (g_driver_dev_build.init_hashmap) {
cleanup_iphashmap();
}
destory_dev();
cleanup_msg();
return -1;
} }
static int __init driver_entry(void) { static int __init driver_entry(void) {
printk(KERN_WARNING "[DebugMessage] safe duck init\n"); printk(KERN_WARNING "[DebugMessage] safe duck init\n");
@@ -99,21 +120,25 @@ static int __init driver_entry(void) {
printk(KERN_ERR "Failed to build device\n"); printk(KERN_ERR "Failed to build device\n");
return -1; return -1;
} }
if (init_ip_hashmap() == false) {
printk(KERN_ERR "Failed to init ip hashmap\n");
return cleanup();
}
g_driver_dev_build.init_hashmap = true;
init_msg(); init_msg();
int rc = nf_register_net_hook(&init_net, &g_network_hook_ops); int rc = nf_register_net_hook(&init_net, &g_network_hook_ops);
if (rc < 0) { if (rc < 0) {
printk(KERN_ERR "Failed to register network hook: %d\n", rc); printk(KERN_ERR "Failed to register network hook: %d\n", rc);
return rc; return cleanup();
} }
g_driver_dev_build.init_netfilter = true;
printk(KERN_WARNING "[DebugMessage] safe duck init success \n"); printk(KERN_WARNING "[DebugMessage] safe duck init success \n");
return 0; return 0;
} }
static void __exit driver_exit(void) { static void __exit driver_exit(void) {
printk(KERN_INFO "[DebugMessage] safe duck exit\n"); printk(KERN_INFO "[DebugMessage] safe duck exit\n");
nf_unregister_net_hook(&init_net, &g_network_hook_ops); cleanup();
cleanup_msg();
destory_dev();
} }
module_init(driver_entry); module_init(driver_entry);

31
linux_kernel/msg.c
View File

@@ -5,6 +5,7 @@ size_t g_msg_length;
void push_msg(struct kernel_msg_t *msg) { void push_msg(struct kernel_msg_t *msg) {
if (get_msg_list_length() > 0x1000) { if (get_msg_list_length() > 0x1000) {
printk(KERN_ERR "Too many messages in the list\n"); printk(KERN_ERR "Too many messages in the list\n");
kfree(msg);
return; return;
} }
struct msg_list *new_msg = kmalloc(sizeof(struct msg_list), GFP_KERNEL); struct msg_list *new_msg = kmalloc(sizeof(struct msg_list), GFP_KERNEL);
@@ -22,6 +23,36 @@ void push_msg(struct kernel_msg_t *msg) {
wake_up_interruptible(&g_r3_wait_queue); wake_up_interruptible(&g_r3_wait_queue);
} }
} }
void push_msg_new_ip_connect(size_t ip_address) {
struct kernel_msg_t *msg = kmalloc(sizeof(struct kernel_msg_t), GFP_KERNEL);
if (msg == NULL) {
printk(KERN_ERR "Failed to allocate memory for new msg\n");
return;
}
msg->type = SD_MSG_TYPE_NEW_IP_CONNECT;
msg->u.ip_action.src_ip = ip_address;
push_msg(msg);
}
void push_msg_syn_attack(size_t ip_address) {
struct kernel_msg_t *msg = kmalloc(sizeof(struct kernel_msg_t), GFP_KERNEL);
if (msg == NULL) {
printk(KERN_ERR "Failed to allocate memory for new msg\n");
return;
}
msg->type = SD_MSG_TYPE_SYN_ATTACK;
msg->u.ip_action.src_ip = ip_address;
push_msg(msg);
}
void push_msg_ssh_bf_attack(size_t ip_address) {
struct kernel_msg_t *msg = kmalloc(sizeof(struct kernel_msg_t), GFP_KERNEL);
if (msg == NULL) {
printk(KERN_ERR "Failed to allocate memory for new msg\n");
return;
}
msg->type = SD_MSG_TYPE_SSH_BF_ATTACK;
msg->u.ip_action.src_ip = ip_address;
push_msg(msg);
}
struct kernel_msg_t *get_msg(void) { struct kernel_msg_t *get_msg(void) {
struct kernel_msg_t *msg = NULL; struct kernel_msg_t *msg = NULL;
struct msg_list *tmp = NULL; struct msg_list *tmp = NULL;

20
linux_kernel/msg.h
View File

@@ -4,6 +4,9 @@
typedef enum _msg_type { typedef enum _msg_type {
SD_MSG_TYPE_ERROR = -1, SD_MSG_TYPE_ERROR = -1,
SD_MSG_TYPE_NEW_IP_CONNECT = 0, SD_MSG_TYPE_NEW_IP_CONNECT = 0,
SD_MSG_TYPE_SYN_ATTACK = 1,
SD_MSG_TYPE_CLIENT_BLOCK_IP = 2,
SD_MSG_TYPE_SSH_BF_ATTACK = 3,
}; };
typedef struct kernel_msg_t { typedef struct kernel_msg_t {
@@ -11,8 +14,18 @@ typedef struct kernel_msg_t {
int type; int type;
union { union {
struct { struct {
unsigned int src_ip; unsigned long src_ip;
} poll_req; } ip_action;
} u;
};
typedef struct client_msg_t {
unsigned long check_sum;
int type;
union {
struct {
unsigned long src_ip;
unsigned long block_time;
} ip_address;
} u; } u;
}; };
typedef struct msg_list { typedef struct msg_list {
@@ -25,3 +38,6 @@ extern struct kernel_msg_t *get_msg(void);
extern size_t get_msg_list_length(void); extern size_t get_msg_list_length(void);
extern void cleanup_msg(void); extern void cleanup_msg(void);
extern void init_msg(void); extern void init_msg(void);
extern void push_msg_syn_attack(size_t ip_address);
extern void push_msg_new_ip_connect(size_t ip_address);
extern void push_msg_ssh_bf_attack(size_t ip_address);

161
linux_kernel/network.c Normal file
View File

@@ -0,0 +1,161 @@
#include "network.h"
void block_ip_address(size_t ip_address, size_t time_sec) {
struct ip_hashmap_node_t *data = get_ipdata_by_hashmap(ip_address);
const s64 current_time_sec = ktime_get_real_seconds();
if (data == NULL) {
struct ip_hashmap_info info;
info.ip_address_key = ip_address;
info.ip_meta_info.last_attack_time = current_time_sec;
info.ip_meta_info.remove_time = current_time_sec + time_sec;
info.ip_meta_info.is_attack = true;
put_ipdata_by_hashmap(ip_address, &info);
return;
}
data->info.ip_meta_info.last_attack_time = current_time_sec;
data->info.ip_meta_info.remove_time = current_time_sec + time_sec;
data->info.ip_meta_info.is_attack = true;
}
bool check_is_blacklist_ip(size_t ip_address) {
struct ip_hashmap_node_t *data = get_ipdata_by_hashmap(ip_address);
if (data == NULL) {
printk(KERN_ERR "Failed to get ip data from hashmap\n");
return false;
}
return data->info.ip_meta_info.is_attack;
}
bool check_syn_attack(struct iphdr *ip_header, struct sk_buff *skb) {
bool is_block = false;
do {
if (ip_header->protocol != IPPROTO_TCP) {
break;
}
struct tcphdr *tcp_header = tcp_hdr(skb);
if (tcp_header == NULL) {
break;
}
if (tcp_header->syn == 0 || tcp_header->ack || tcp_header->rst) {
break;
}
size_t ip_address_key = ip_header->saddr;
struct ip_hashmap_node_t *data = get_ipdata_by_hashmap(ip_address_key);
const s64 current_time_sec = ktime_get_real_seconds();
if (data == NULL) {
struct ip_hashmap_info info;
info.ip_address_key = ip_address_key;
info.syn_scan_info.last_seen = current_time_sec;
info.syn_scan_info.num_syn_packets = 1;
put_ipdata_by_hashmap(ip_address_key, &info);
break;
}
s64 time_diff = current_time_sec - data->info.syn_scan_info.last_seen;
if (time_diff >= SYN_SCAN_TIME) {
data->info.syn_scan_info.num_syn_packets = 0;
data->info.syn_scan_info.last_seen = current_time_sec;
break;
}
data->info.syn_scan_info.num_syn_packets++;
if (data->info.syn_scan_info.num_syn_packets >= SYN_SCAN_THRESHOLD) {
// printk(KERN_ERR "SYN attack detected from %pI4 num packet: %d
// \n",
// &ip_header->saddr,
// data->info.syn_scan_info.num_syn_packets);
push_msg_syn_attack(ip_address_key);
block_ip_address(ip_address_key, IP_ATTCK_BLOCK_TIME);
is_block = true;
}
} while (false);
return is_block;
}
bool check_ssh_brute_force_attack(struct iphdr *ip_header,
struct sk_buff *skb) {
bool is_block = false;
do {
if (ip_header->protocol != IPPROTO_TCP) {
break;
}
struct tcphdr *tcp_header = tcp_hdr(skb);
if (tcp_header == NULL) {
break;
}
if ((tcp_header->syn == 1) && (tcp_header->ack == 0)) {
break;
}
// check port
if (ntohs(tcp_header->dest) != SSH_PORT) {
break;
}
size_t ip_address_key = ip_header->saddr;
struct ip_hashmap_node_t *data = get_ipdata_by_hashmap(ip_address_key);
const s64 current_time_sec = ktime_get_real_seconds();
if (data == NULL) {
struct ip_hashmap_info info;
info.ip_address_key = ip_address_key;
info.crack_ip_info.last_seen = current_time_sec;
info.crack_ip_info.num_connect = 1;
put_ipdata_by_hashmap(ip_address_key, &info);
break;
}
s64 time_diff = current_time_sec - data->info.crack_ip_info.last_seen;
if (time_diff >= SSH_BRUTE_FORCE_TIME) {
data->info.crack_ip_info.num_connect = 0;
data->info.crack_ip_info.last_seen = current_time_sec;
break;
}
data->info.crack_ip_info.num_connect++;
if (data->info.crack_ip_info.num_connect >= SSH_BRUTE_FORCE_THRESHOLD) {
// printk(KERN_ERR "SYN attack detected from %pI4 num packet: %d
// \n",
// &ip_header->saddr,
// data->info.syn_scan_info.num_syn_packets);
push_msg_ssh_bf_attack(ip_address_key);
block_ip_address(ip_address_key, IP_ATTCK_BLOCK_TIME);
is_block = true;
}
} while (false);
return is_block;
}
unsigned int network_callback(const struct nf_hook_ops *ops,
struct sk_buff *skb, const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *)) {
bool is_block = false;
do {
if (skb == NULL) {
break;
}
struct iphdr *ip_header = ip_hdr(skb);
if (ip_header == NULL) {
break;
}
if (check_is_blacklist_ip(ip_header->saddr)) {
is_block = true;
printk(KERN_ERR "Block ip address: %pI4\n", &ip_header->saddr);
break;
}
if (check_syn_attack(ip_header, skb)) {
is_block = true;
break;
}
if (check_ssh_brute_force_attack(ip_header, skb)) {
is_block = true;
break;
}
struct tcphdr *tcp_header = tcp_hdr(skb);
if (tcp_header == NULL) {
break;
}
if ((tcp_header->syn == 1) && (tcp_header->ack == 0)) {
// push ip address to list
push_msg_new_ip_connect(ip_header->saddr);
}
} while (false);
return is_block ? NF_DROP : NF_ACCEPT;
}

15
linux_kernel/network.h Normal file
View File

@@ -0,0 +1,15 @@
#pragma once
#include "head.h"
#define IP_ATTCK_BLOCK_TIME 600
#define SYN_SCAN_THRESHOLD 500
#define SYN_SCAN_TIME 10
#define SSH_BRUTE_FORCE_THRESHOLD 10
#define SSH_BRUTE_FORCE_TIME 5
#define SSH_PORT 22
extern unsigned int network_callback(const struct nf_hook_ops *ops,
struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *));
extern void block_ip_address(size_t ip_address, size_t time_sec);
extern bool check_is_blacklist_ip(size_t ip_address);

1
linux_kernel/some_struct.c
View File

@@ -14,4 +14,5 @@ struct file_operations g_fops = {
.open = safe_duck_open, .open = safe_duck_open,
.release = safe_duck_release, .release = safe_duck_release,
.read = safe_duck_read, .read = safe_duck_read,
.write = safe_duck_write,
}; };

7
linux_kernel/some_struct.h
View File

@@ -11,6 +11,8 @@ extern int safe_duck_open(struct inode *inode, struct file *filep);
extern int safe_duck_release(struct inode *inode, struct file *file); extern int safe_duck_release(struct inode *inode, struct file *file);
extern ssize_t safe_duck_read(struct file *file, char __user *buf, size_t count, extern ssize_t safe_duck_read(struct file *file, char __user *buf, size_t count,
loff_t *pos); loff_t *pos);
extern ssize_t safe_duck_write(struct file *filp, const char __user *buf,
size_t count, loff_t *f_pos);
struct _driver_dev_build { struct _driver_dev_build {
int major; int major;
int minor; int minor;
@@ -18,6 +20,11 @@ struct _driver_dev_build {
dev_t devid; // device num dev_t devid; // device num
struct class *class; // class struct class *class; // class
struct device *device; // device struct device *device; // device
bool init_chrdev_region;
bool init_cdev_add;
bool init_device_create;
bool init_netfilter;
bool init_hashmap;
}; };
extern struct nf_hook_ops g_network_hook_ops; extern struct nf_hook_ops g_network_hook_ops;
extern struct file_operations g_fops; extern struct file_operations g_fops;

2
linux_service/CMakeLists.txt
View File

@@ -2,4 +2,4 @@ cmake_minimum_required(VERSION 3.10)
project(safe_duck) project(safe_duck)
add_executable(safe_duck safe_duck.cpp) add_executable(safe_duck safe_duck.cpp msg.cpp tools.cpp global.cpp)

4
linux_service/build/build.sh → linux_service/build.sh
View File

@@ -4,7 +4,8 @@
# 设定变量 # 设定变量
MODULE_NAME=safe_duck MODULE_NAME=safe_duck
TARGET_DIR="/run/user/1000/gvfs/smb-share:server=192.168.1.2,share=dev_share" TARGET_DIR="/run/user/1000/gvfs/smb-share:server=192.168.1.2,share=dev_share"
cmake build;
cd build;
# 编译模块 # 编译模块
if make; then if make; then
@@ -24,3 +25,4 @@ else
echo "Failed to build ${MODULE_NAME}" echo "Failed to build ${MODULE_NAME}"
fi fi
make clean

4
linux_service/build/CMakeFiles/Makefile2
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@@ -81,12 +81,12 @@ clean: CMakeFiles/safe_duck.dir/clean
CMakeFiles/safe_duck.dir/all: CMakeFiles/safe_duck.dir/all:
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$(MAKE) $(MAKESILENT) -f CMakeFiles/safe_duck.dir/build.make CMakeFiles/safe_duck.dir/build $(MAKE) $(MAKESILENT) -f CMakeFiles/safe_duck.dir/build.make CMakeFiles/safe_duck.dir/build
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.PHONY : CMakeFiles/safe_duck.dir/all .PHONY : CMakeFiles/safe_duck.dir/all
# Build rule for subdir invocation for target. # Build rule for subdir invocation for target.
CMakeFiles/safe_duck.dir/rule: cmake_check_build_system CMakeFiles/safe_duck.dir/rule: cmake_check_build_system
$(CMAKE_COMMAND) -E cmake_progress_start /home/duck/project/linux_service/build/CMakeFiles 2 $(CMAKE_COMMAND) -E cmake_progress_start /home/duck/project/linux_service/build/CMakeFiles 5
$(MAKE) $(MAKESILENT) -f CMakeFiles/Makefile2 CMakeFiles/safe_duck.dir/all $(MAKE) $(MAKESILENT) -f CMakeFiles/Makefile2 CMakeFiles/safe_duck.dir/all
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.PHONY : CMakeFiles/safe_duck.dir/rule .PHONY : CMakeFiles/safe_duck.dir/rule

2
linux_service/build/CMakeFiles/progress.marks
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@@ -1 +1 @@
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@@ -8,7 +8,10 @@ set(CMAKE_DEPENDS_LANGUAGES
# The set of dependency files which are needed: # The set of dependency files which are needed:
set(CMAKE_DEPENDS_DEPENDENCY_FILES set(CMAKE_DEPENDS_DEPENDENCY_FILES
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"/home/duck/project/linux_service/msg.cpp" "CMakeFiles/safe_duck.dir/msg.cpp.o" "gcc" "CMakeFiles/safe_duck.dir/msg.cpp.o.d"
"/home/duck/project/linux_service/safe_duck.cpp" "CMakeFiles/safe_duck.dir/safe_duck.cpp.o" "gcc" "CMakeFiles/safe_duck.dir/safe_duck.cpp.o.d" "/home/duck/project/linux_service/safe_duck.cpp" "CMakeFiles/safe_duck.dir/safe_duck.cpp.o" "gcc" "CMakeFiles/safe_duck.dir/safe_duck.cpp.o.d"
"/home/duck/project/linux_service/tools.cpp" "CMakeFiles/safe_duck.dir/tools.cpp.o" "gcc" "CMakeFiles/safe_duck.dir/tools.cpp.o.d"
) )
# Targets to which this target links. # Targets to which this target links.

52
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@@ -83,17 +83,65 @@ CMakeFiles/safe_duck.dir/safe_duck.cpp.s: cmake_force
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81
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2
linux_service/global.cpp Normal file
View File

@@ -0,0 +1,2 @@
#include "global.h"
namespace global {};

3
linux_service/global.h Normal file
View File

@@ -0,0 +1,3 @@
#pragma once
#include "head.h"
namespace global {};

10
linux_service/head.h Normal file
View File

@@ -0,0 +1,10 @@
#include <fcntl.h>
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string>
#include "global.h"
#include "msg.h"
#include "tools.h"

90
linux_service/msg.cpp Normal file
View File

@@ -0,0 +1,90 @@
#include "msg.h"
namespace client_msg {
int driver_read;
int driver_write;
auto call_driver(client_msg_t msg) -> bool {
int is_success = write(driver_write, &msg, sizeof(client_msg_t));
if (is_success == 0) {
perror("Failed to write message to safe_duck device");
return false;
}
return true;
}
auto block_ip(size_t ip_address, size_t time_sec) -> bool {
client_msg_t msg;
msg.check_sum = MSG_CHECK_SUM;
msg.type = SD_MSG_TYPE_CLIENT_BLOCK_IP;
msg.u.ip_address.src_ip = ip_address;
msg.u.ip_address.block_time = time_sec;
return call_driver(msg);
}
auto dispath_kernel_msg_i(_msg_type type, kernel_msg_t msg) -> void {
switch (type) {
case SD_MSG_TYPE_NEW_IP_CONNECT: {
auto ip_str = tools::cover_ip(msg.u.ip_action.src_ip);
printf("New IP connection: %s\n", ip_str.c_str());
} break;
case SD_MSG_TYPE_SYN_ATTACK: {
auto ip_str = tools::cover_ip(msg.u.ip_action.src_ip);
printf("Block ip for syn attack: %s \n", ip_str.c_str());
} break;
case SD_MSG_TYPE_SSH_BF_ATTACK: {
auto ip_str = tools::cover_ip(msg.u.ip_action.src_ip);
printf("Block ip for SSH brute force attack: %s \n",
ip_str.c_str());
} break;
default:
printf("Unknown message type: %d\n", msg.type);
break;
}
}
auto dispath_kernel_msg() -> void {
int fd = driver_read;
while (1) {
struct pollfd fds[1];
fds[0].fd = fd;
fds[0].events = POLLIN;
printf("Waiting for message from safe_duck device...\n");
int ret = poll(fds, 1, -1);
if (ret < 0) {
perror("poll failed");
close(fd);
return;
}
printf("Got message from safe_duck device\n");
if (fds[0].revents & POLLIN) {
kernel_msg_t msg;
int is_success = read(fd, &msg, sizeof(kernel_msg_t));
if (is_success == 0 && msg.check_sum == MSG_CHECK_SUM) {
dispath_kernel_msg_i((_msg_type)msg.type, msg);
} else {
perror("Failed to read message from safe_duck device");
}
}
}
}
auto init() -> bool {
driver_read = open("/dev/safe_duck", O_RDWR);
if (driver_read < 0) {
perror("Failed to open safe_duck device");
return false;
}
driver_write = open("/dev/safe_duck", O_RDWR);
if (driver_write < 0) {
perror("Failed to open safe_duck device");
return false;
}
return true;
}
auto uninstall() -> void {
if (driver_write) {
close(driver_write);
driver_write = 0;
}
if (driver_read) {
close(driver_read);
driver_read = 0;
}
}
} // namespace client_msg

37
linux_service/msg.h Normal file
View File

@@ -0,0 +1,37 @@
#pragma once
#include "head.h"
#define MSG_CHECK_SUM 1337
typedef enum _msg_type {
SD_MSG_TYPE_ERROR = -1,
SD_MSG_TYPE_NEW_IP_CONNECT = 0,
SD_MSG_TYPE_SYN_ATTACK = 1,
SD_MSG_TYPE_CLIENT_BLOCK_IP = 2,
SD_MSG_TYPE_SSH_BF_ATTACK = 3,
};
typedef struct kernel_msg_t {
unsigned long check_sum;
int type;
union {
struct {
unsigned long src_ip;
} ip_action;
} u;
};
typedef struct client_msg_t {
unsigned long check_sum;
int type;
union {
struct {
unsigned long src_ip;
unsigned long block_time;
} ip_address;
} u;
};
namespace client_msg {
auto dispath_kernel_msg() -> void;
auto block_ip(size_t ip_address, size_t time_sec) -> bool;
auto init() -> bool;
auto call_driver(client_msg_t msg) -> bool;
auto uninstall() -> void;
} // namespace client_msg

68
linux_service/safe_duck.cpp
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@@ -1,68 +1,8 @@
#include <fcntl.h> #include "head.h"
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <string>
#include <unistd.h>
#define MSG_CHECK_SUM 1337
typedef enum _msg_type {
SD_MSG_TYPE_ERROR = -1,
SD_MSG_TYPE_NEW_IP_CONNECT = 0,
};
typedef struct kernel_msg_t { auto main() -> int {
unsigned long check_sum; if (client_msg::init()) {
int type; client_msg::dispath_kernel_msg();
union {
struct {
unsigned int src_ip;
} poll_req;
} u;
};
auto cover_ip(unsigned int ip) -> std::string {
std::string ip_str;
ip_str = std::to_string(ip & 0xff) + "." +
std::to_string((ip >> 8) & 0xff) + "." +
std::to_string((ip >> 16) & 0xff) + "." +
std::to_string((ip >> 24) & 0xff);
return ip_str;
}
int main() {
int fd = open("/dev/safe_duck", O_RDWR);
if (fd < 0) {
perror("Failed to open safe_duck device");
return 1;
} }
while (1) {
struct pollfd fds[1];
fds[0].fd = fd;
fds[0].events = POLLIN;
printf("Waiting for message from safe_duck device...\n");
int ret = poll(fds, 1, -1);
if (ret < 0) {
perror("poll failed");
close(fd);
return 1;
}
printf("Got message from safe_duck device\n");
if (fds[0].revents & POLLIN) {
kernel_msg_t msg;
int is_success = read(fd, &msg, sizeof(kernel_msg_t));
if (is_success == 0 && msg.check_sum == MSG_CHECK_SUM) {
if (msg.type == SD_MSG_TYPE_NEW_IP_CONNECT) {
auto ip_str = cover_ip(msg.u.poll_req.src_ip);
printf("New IP connection: %s\n", ip_str.c_str());
} else {
printf("Unknown message type: %d\n", msg.type);
}
} else {
perror("Failed to read message from safe_duck device");
}
}
}
close(fd);
return 0; return 0;
} }

11
linux_service/tools.cpp Normal file
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@@ -0,0 +1,11 @@
#include "tools.h"
namespace tools {
auto cover_ip(unsigned int ip) -> std::string {
std::string ip_str;
ip_str = std::to_string(ip & 0xff) + "." +
std::to_string((ip >> 8) & 0xff) + "." +
std::to_string((ip >> 16) & 0xff) + "." +
std::to_string((ip >> 24) & 0xff);
return ip_str;
}
} // namespace tools

5
linux_service/tools.h Normal file
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@@ -0,0 +1,5 @@
#pragma once
#include "head.h"
namespace tools {
auto cover_ip(unsigned int ip) -> std::string;
} // namespace tools